This image shows the dark, leading hemisphere of the mysterious moon
Iapetus. The dark area is the Cassini region, named for Giovanni Cassini,
who discovered the moon in 1672. The diameter of Iapetus is 1,436
kilometers (892 miles).
Cassini noted that he was able to see the moon on one side of its orbit
around Saturn, but not on the other side. From this, he correctly deduced
that one hemisphere must be dark while the other is much brighter.
The image was taken in visible light with the Cassini spacecraft narrow
angle camera on Sept. 24, 2004, at a distance of 7.4 million kilometers
(4.6 million miles) from Iapetus and at a Sun-Iapetus-spacecraft, or
phase, angle of 51 degrees. The image scale is 45 kilometers (28 miles)
per pixel. The image has been magnified by a factor of four to aid
visibility.
The Cassini-Huygens mission is a cooperative project of NASA, the
European Space Agency and the Italian Space Agency. The Jet Propulsion
Laboratory, a division of the California Institute of Technology in
Pasadena, manages the Cassini-Huygens mission for NASA's Science Mission
Directorate, Washington, D.C. The Cassini orbiter and its two onboard
cameras were designed, developed and assembled at JPL. The imaging team
is based at the Space Science Institute, Boulder, Colo.
For more information, about the Cassini-Huygens mission visit,
http://saturn.jpl.nasa.gov and the Cassini imaging team home page,
http://ciclops.org.
